Project overview
A regional project beginning in March 2024 updated 24 guardrails and attenuators along Interstates 5, 90 and 405, US 2 and State Routes 522 and 527 in King, Snohomish and Whatcom counties. The breakaway cable terminals, or guardrail protective end caps, face oncoming traffic. This project also replaced impact attenuators, which act like a cushion protecting concrete barriers, at the James Street and Northeast 71st Street exits from southbound I-5 in Seattle.
In September 2023, a second regional project improved and preserved a five-mile stretch of SR 18 near the Tiger Mountain State Forest. The project sealed cracks between Issaquah-Hobart Road Southeast and just south of Raging River. After pausing during the winter, the project resumed in April and made pavement repairs on 27 ramps at 12 interchanges along I-405 in Tukwila, Kirkland and Bothell, SR 509 in SeaTac, and SR 99/SR 599 in Tukwila and Edmonds.
A second phase of the regional repair project began work in May 2024, and will continue pavement repairs, grinding down damaged sections of pavement and repairing those sections with hot mix asphalt. The project also will retrofit curb ramps to meet Americans with Disabilities Act requirements and upgrade signals. Work is scheduled on I-5 ramps in SeaTac and Seattle, I-405 ramps in Tukwila and Kirkland and on SR 18 from Issaquah-Hobart Road to just south of Deep Creek.
What to expect
During ramp pavement repairs, expect nighttime ramp, lane and shoulder closures, with signed detours available where needed. Work on the curb ramps will require sidewalk closures, with pedestrian detours available.
The guardrail protective end cap along the Swift Avenue South on-ramp to northbound I-5 in Seattle was replaced on Monday, March 11.
Breakaway cable terminal replacements
Breakaway cable terminal or attenuator replacements are planned for:
- I-5: King, Snohomish and Whatcom counties
- Swift Avenue South on-ramp to northbound I-5 in Seattle (complete)
- Yale Avenue on-ramp to southbound I-5 in Seattle (complete)
- Northbound I-5 at milepost 215 near Stanwood (complete)
- SR 523/Northeast 145th Street on-ramp to southbound I-5 in Shoreline (complete)
- South Spokane Street on-ramp to southbound I-5 in Seattle (complete)
- Southbound I-5 off-ramp to Northeast 71st Street in Seattle (complete)
- Southbound I-5 off-ramp to James Street in Seattle (complete)
- Olive Way on-ramp to northbound I-5 in Seattle (complete)
- Iowa Street on-ramp to northbound I-5 in Bellingham (complete)
- I-405: King and Snohomish counties
- Southbound I-405 off-ramp to Northeast 124th Street in Kirkland (complete)
- Northeast 124th Street on-ramp to southbound I-405 in Kirkland (complete)
- Northbound I-405 ramp to westbound SR 520 in Bellevue (complete)
- I-90: King County
- East Lake Sammamish Parkway/Front Street on-ramp to westbound I-90 in Issaquah (complete)
- 17th Avenue Northwest on-ramp to westbound I-90 in Issaquah (complete)
- US 2: Snohomish County
- Westbound US 2 at milepost 6.61 near Snohomish (complete)
- Eastbound US 2 off-ramp to 88th Street Southeast near Snohomish (complete)
- SR 522: King and Snohomish counties
- Eastbound and westbound SR 522 between mileposts 17 and 18 near Woodinville (complete)
- Eastbound SR 522 off-ramp to Northeast 195th Street in Woodinville (complete)
- SR 527: Snohomish County
- Northbound SR 527/Bothell Everett Highway ramp to southbound I-405 in Bothell (complete)
- Southbound SR 527/Bothell Everett Highway ramp to northbound I-405 in Bothell (complete)
NOTE: Some locations will have work in more than one location.
Pavement crack sealing and repair (Phase 1)
The repair projects will rehabilitate the following roadways and ramps and preserve them for years to come:
King County
Highway repairs
- Section 15: SR 18 between Issaquah-Hobart Road Southeast and just south of Raging River - mileposts 20.70 to 25.68 (complete)
Ramp repairs
- Section 1: I-405 exit 1 (SR 181/Interurban Avenue South in Tukwila)
- Northbound I-405 ramp to SR 181/West Valley Highway (complete)
- Southbound I-405 ramp to SR 181/Interurban Avenue South (complete)
- Section 3: I-405 exit 20 (Northeast 124th Street/Totem Lake Boulevard and Northeast 128th Street in Kirkland)
- Westbound Northeast 124th Street on-ramp to southbound I-405 (complete)
- Eastbound Northeast 124th Street on-ramp to southbound I-405 (complete)
- Northeast 128th Street on-ramp to southbound I-405 express toll lanes (complete)
- Northbound I-405 off-ramp to Totem Lake Boulevard/Northeast 124th Street (complete)
- Southbound I-405 off-ramp to Northeast 124th Street (complete)
- Totem Lake Boulevard on-ramp to northbound I-405 (complete)
- Westbound Northeast 124th Street on-ramp to northbound I-405 (complete)
- Northeast 128th Street on-ramp to northbound I-405 express toll lanes (complete)
- Section 4: I-405 exit 22 (Northeast 160th Street in Bothell)
- Northeast 160th Street on-ramp to southbound I-405 (complete)
- Southbound I-405 off-ramp to Northeast 160th Street (complete)
- Northeast 160th Street on-ramp to northbound I-405 (complete)
- Northbound I-405 off-ramp to Northeast 160th Street (complete)
- Section 5: I-405 exit 23B (Campus Way Northeast in Bothell)
- Southbound I-405 off-ramp to WB SR 522/Campus Way Northeast (complete)
- Section 6: SR 509 exit to Des Moines Memorial Drive (in SeaTac)
- Southbound SR 509 ramp to Des Moines Memorial Drive (complete)
- Section 7: SR 509 exit to South 160th Street (in Burien)
- Southbound SR 509 ramp to South 160th Street (complete)
- Northbound SR 509 ramp to South 160th Street (complete)
- Section 8: SR 99/SR 599 exit to South 116th Street/Tukwila International Boulevard (in Tukwila)
- Southbound SR 99 ramp to South 116th Way (complete)
- Southbound SR 99 ramp to Tukwila International Boulevard (complete)
- Northbound SR 599 ramp to southbound Tukwila International Boulevard (complete)
- Section 9: Northbound SR 99 ramp to South 102nd Street (complete)
- Section 10: Des Moines Drive South ramp to northbound SR 99 (complete)
- Section 11: South Michigan Street to First Avenue Bridge/SR 99 (complete)
Snohomish County
Ramp repairs
- Section 14: SR 99 exit to SR 104 (in Shoreline)
- Eastbound SR 104 to southbound SR 99 (complete)
- Southbound SR 99 to eastbound SR 104 (complete)
NOTE: Sections 2, 12 and 13 have been removed from the project.
Ramps HMA Paving and ADA (Phase 2)
- Section 1: I-5 exit 152 (southbound off-ramps to South 188th Street and Orillia South in SeaTac)
- Work included pavement repairs, curb ramp retrofit and signal work.
- Section 2: I-405 exit 1 (northbound on-ramp from SR 181/West Valley Highway in Tukwila)
- Work included pavement repairs.
- Section 3: I-5 exit 158 (southbound off-ramp to Boeing Access Road and northbound on-ramp from Boeing Access Road/Marting Luther King Jr. Way South in Tukwila)
- Work included pavement repairs, curb ramp retrofit and signal work.
- Section 4: I-405 exit 20B (northbound on-ramps from eastbound and westbound Northeast 124th Street and Totem Lake Boulevard)
- Work included pavement repairs.
- Section 5: SR 18 (milepost 20 to 26 – Issaquah-Hobart Road to south of Deep Creek)
- Work included pavement repairs.
